Display module and display device

Abstract

The present application discloses a display module and a display device. The display module includes a light grating assembly. The light grating assembly includes alternately arranged first regions and second regions, and liquid crystal molecules and dye molecules distributed in the first regions and the second regions. Arrangement of the liquid crystal molecules and the dye molecules are controlled to make the first regions light-transmissive and the second regions light-transmissive under a first mode and not light-transmissive under a second mode to form alternately light and dark stripes under the second mode.

What is claimed is: 
     
       1. A display module, comprising a display panel, a light grating assembly disposed on a side of the display panel, and a first polarizer disposed between the display panel and the light grating assembly;
 wherein the light grating assembly comprises a plurality of first regions and a plurality of second regions alternately disposed, one of the second regions is disposed between adjacent two of the first regions; 
 wherein the light grating assembly further comprises:
 a first substrate; 
 a second substrate disposed opposite to the first substrate; and 
 a liquid crystal layer disposed between the first substrate and the second substrate, and comprising first liquid crystal molecules and first dye molecules distributed in the first regions and second liquid crystal molecules and second dye molecules distributed in the second regions; 
 
 wherein the display module switches between a first mode and a second mode, under the first mode, a light transmission axis direction of the first dye molecules, a light transmission axis direction of the second dye molecules are parallel to a light transmission axis direction of the first polarizer to make light pass through the first regions and the second regions; under the second mode, a light transmission axis direction of the first dye molecules is parallel to the light transmission axis direction of the first polarizer, a light absorbing axis direction of the second dye molecules is parallel to the light transmission axis direction of the first polarizer to make an amount of light passing through the first regions greater than an amount of light passing through the second regions. 
 
     
     
       2. The display module according to  claim 1 , wherein under the first mode, long axes of the first liquid crystal molecules, long axes of the first dye molecules, long axes of the second liquid crystal molecules, and long axes of the second dye molecules are arranged along a first direction, under the second mode, the long axes of the first liquid crystal molecules and the long axes of the first dye molecules are arranged along the first direction, and the long axes of the second liquid crystal molecules and the long axes of the second dye molecules are arranged along a second direction, and the first direction is perpendicular to the second direction;
 wherein a light absorbing axis direction of the first dye molecules is parallel to a long axis direction of the first dye molecules, the light absorbing axis direction of the second dye molecules is parallel to a long axis direction of the second dye molecules, the light transmission axis direction of the first polarizer is parallel to the second direction. 
 
     
     
       3. The display module according to  claim 2 , wherein the light grating assembly further comprises a first electrode layer disposed on a side of the first substrate near the second substrate and a second electrode layer disposed on a side of the second substrate near the first substrate, the first electrode layer and the second electrode layer are configured to apply a voltage and at least adjust an arrangement direction of the long axes of the second liquid crystal molecules arrangement direction to control the display module to switch between the first mode and the second mode. 
     
     
       4. The display module according to  claim 3 , wherein the first liquid crystal molecules and the second liquid crystal molecules are negative liquid crystals, and the first electrode layer comprises first sub-electrodes disposed in the second regions. 
     
     
       5. The display module according to  claim 4 , wherein the light grating assembly further comprises a first alignment layer disposed on a side of the first electrode layer away from the first substrate and a second alignment layer disposed on a side of the second electrode layer away from the second substrate such that an the initial alignment direction of the first liquid crystal molecules and an the initial alignment direction of the second liquid crystal molecules are parallel to the first direction. 
     
     
       6. The display module according to  claim 3 , wherein the first liquid crystal molecules and the second liquid crystal molecules are positive liquid crystals, the first electrode layer comprises second sub-electrodes disposed in the first regions and third sub-electrodes disposed in the second regions, the light grating assembly further comprises first wirings connected to the second sub-electrodes and second wirings connected to the third sub-electrodes to apply voltages to the second sub-electrodes and the third sub-electrodes respectively. 
     
     
       7. The display module according to  claim 6 , wherein the light grating assembly further comprises a third alignment layer disposed on a side of the first electrode layer away from the first substrate and a fourth alignment layer disposed on a side of the second electrode layer away from the second substrate such that an the initial alignment direction of the first liquid crystal molecules and an the initial alignment direction of the second liquid crystal molecules are perpendicular to the first direction. 
     
     
       8. The display module according to  claim 2 , wherein the first direction is perpendicular to the first substrate and the second substrate. 
     
     
       9. A display module, comprising a display panel and a light grating assembly disposed on a side of the display panel;
 wherein the light grating assembly comprises a plurality of first regions and a plurality of second regions alternately disposed, one of the second regions is disposed between adjacent two of the first regions; 
 wherein the light grating assembly further comprises:
 a first substrate; 
 a second substrate disposed opposite to the first substrate; and 
 a liquid crystal layer disposed between the first substrate and the second substrate and comprising first polymer liquid crystals and first dye molecules distributed in the first regions and second polymer liquid crystals and second dye molecules distributed in the second regions, and the first polymer liquid crystals comprises first liquid crystal molecules and first polymer structures, the second polymer liquid crystals comprises second liquid crystal molecules and second polymer structures; 
 
 wherein the display module switches between a first mode and a second mode, under the first mode, light entering the liquid crystal layer along a third direction has a refractive index through the first liquid crystal molecules the same as a refractive index through the first polymer structures, long axes of the second liquid crystal molecules and long axes of the second dye molecules are arranged along the third direction, and the third direction is perpendicular to the first substrate and the second substrate such that the light passes through the first regions and the second regions, under the second mode, light entering the liquid crystal layer along the third direction has the refractive index through the first liquid crystal molecules the same as the refractive index through the first polymer structures, and has a refractive index through at least some of the second liquid crystal molecules different from a refractive index through the second polymer structures such that an amount of the light passing through the first regions is greater than an amount of the light passing through the second regions. 
 
     
     
       10. The display module according to  claim 9 , wherein the first liquid crystal molecules and the second liquid crystal molecules are positive liquid crystals, the first polymer liquid crystals and the second polymer liquid crystals are polymer dispersed liquid crystals, under the first mode, long axes of the first liquid crystal molecules and long axes of the first dye molecules are arranged along the third direction such that the light entering the liquid crystal layer along the third direction has the refractive index through the first liquid crystal molecules the same as the refractive index through the first polymer structures. 
     
     
       11. The display module according to  claim 10 , wherein under the second mode, long axes of at least some of the second liquid crystal molecules are arranged along a direction other than the third direction such that the light entering the liquid crystal layer along the third direction has the refractive index through at least some of the second liquid crystal molecules different from the refractive index through the second polymer structures. 
     
     
       12. The display module according to  claim 9 , wherein the first liquid crystal molecules and the second liquid crystal molecules are negative liquid crystals, and the first polymer liquid crystals and the second polymer liquid crystals are polymer network liquid crystals, under the first mode, long axes of the first liquid crystal molecules, long axes of the first dye molecules, and the first polymer structures are arranged along a fourth direction, the long axes of the second liquid crystal molecules, the long axes of the second dye molecules, and the second polymer structures are arranged along the third direction, and the fourth direction is perpendicular to the third direction. 
     
     
       13. The display module according to  claim 12 , wherein under the second mode, long axes of the first liquid crystal molecules, long axes of the first dye molecules, long axes of the second liquid crystal molecules, long axes of the second dye molecules, and the first polymer structures are arranged along the fourth direction and the second polymer structures is arranged along the third direction. 
     
     
       14. The display module according to  claim 9 , wherein the light grating assembly further comprises a first electrode layer disposed on a side of the first substrate near the second substrate and a second electrode layer disposed on a side of the second substrate near the first substrate, the first electrode layer and the second electrode layer are configured to apply a voltage and at least adjust an arrangement direction of the long axes of the second liquid crystal molecules arrangement direction to control the display module to switch between the first mode and the second mode. 
     
     
       15. A display device, comprising a display module, the display module comprising a display panel and a light grating assembly disposed on a side of the display panel;
 wherein the light grating assembly comprises a plurality of first regions and a plurality of second regions alternately disposed, one of the second regions is disposed between adjacent two of the first regions; 
 wherein the light grating assembly further comprises:
 a first substrate; 
 a second substrate disposed opposite to the first substrate; and 
 a liquid crystal layer disposed between the first substrate and the second substrate and comprising first polymer liquid crystals and first dye molecules distributed in the first regions and second polymer liquid crystals and second dye molecules distributed in the second regions, and the first polymer liquid crystals comprises first liquid crystal molecules and first polymer structures, the second polymer liquid crystals comprises second liquid crystal molecules and second polymer structures; 
 
 wherein the display module switches between a first mode and a second mode, under the first mode, light entering the liquid crystal layer along a third direction has a refractive index through the first liquid crystal molecules the same as a refractive index through the first polymer structures, long axes of the second liquid crystal molecules and long axes of the second dye molecules are arranged along the third direction, and the third direction is perpendicular to the first substrate and the second substrate such that the light passes through the first regions and the second regions, under the second mode, light entering the liquid crystal layer along the third direction has the refractive index through the first liquid crystal molecules the same as the refractive index through the first polymer structures, and has a refractive index through at least some of the second liquid crystal molecules different from a refractive index through the second polymer structures such that an amount of the light passing through the first regions is greater than an amount of the light passing through the second regions. 
 
     
     
       16. The display device according to  claim 15 , wherein the first liquid crystal molecules and the second liquid crystal molecules are positive liquid crystals, the first polymer liquid crystals and the second polymer liquid crystals are polymer dispersed liquid crystals, under the first mode, long axes of the first liquid crystal molecules and long axes of the first dye molecules are arranged along the third direction such that the light entering the liquid crystal layer along the third direction has the refractive index through the first liquid crystal molecules the same as the refractive index through the first polymer structures. 
     
     
       17. The display device according to  claim 16 , wherein under the second mode, long axes of at least some of the second liquid crystal molecules are arranged along a direction other than the third direction such that the light entering the liquid crystal layer along the third direction has the refractive index through at least some of the second liquid crystal molecules different from the refractive index through the second polymer structures. 
     
     
       18. The display device according to  claim 15 , wherein the first liquid crystal molecules and the second liquid crystal molecules are negative liquid crystals, and the first polymer liquid crystals and the second polymer liquid crystals are polymer network liquid crystals, under the first mode, long axes of the first liquid crystal molecules, long axes of the first dye molecules, and the first polymer structures are arranged along a fourth direction, the long axes of the second liquid crystal molecules, the long axes of the second dye molecules, and the second polymer structures are arranged along the third direction, and the fourth direction is perpendicular to the third direction. 
     
     
       19. The display device according to  claim 18 , wherein under the second mode, long axes of the first liquid crystal molecules, long axes of the first dye molecules, long axes of the second liquid crystal molecules, long axes of the second dye molecules, and the first polymer structures are arranged along the fourth direction and the second polymer structures is arranged along the third direction. 
     
     
       20. The display device according to  claim 15 , wherein the light grating assembly further comprises a first electrode layer disposed on a side of the first substrate near the second substrate and a second electrode layer disposed on a side of the second substrate near the first substrate, the first electrode layer and the second electrode layer are configured to apply a voltage and at least adjust an arrangement direction of the long axes of the second liquid crystal molecules arrangement direction to control the display module to switch between the first mode and the second mode.